package org.edu.modules.common.util;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Hashtable;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class IdCardUtil {
    // 权重因子
    private static final int[] WEIGHT_FACTOR = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
    // 校验码字符集
    private static final char[] CHECK_CODE = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};

    public static String IdentityCardVerification(String idStr) {

        String iDCardNo = "";
        try {
            if ((idStr.length() != 15) && (idStr.length() != 18)) {
                return "身份证号码长度应该为15位或18位";
            }
            if (idStr.length() == 18) {
                iDCardNo = idStr.substring(0, 18);
            } else if (idStr.length() == 15) {
                iDCardNo = idStr.substring(0, 7) + "19" + idStr.substring(7, 16);
            }
            // 验证前17位是否为数字
            for (int i = 0; i < 17; i++) {
                char c = iDCardNo.charAt(i);
                if (!Character.isDigit(c)) {
                    return "身份证无效，不是合法的身份证号码";
                }
            }
            // 验证第18位是否为数字或字母X
            char lastChar = iDCardNo.charAt(17);
            if (!(Character.isDigit(lastChar) || lastChar == 'X' || lastChar == 'x')) {
                return "身份证无效，不是合法的身份证号码";
            }
            String strYear = iDCardNo.substring(6, 10);
            String strMonth = iDCardNo.substring(10, 12);
            String strDay = iDCardNo.substring(12, 14);
            if (!isStrDate(strYear + "-" + strMonth + "-" + strDay)) {
                return "身份证生日无效";
            }
            GregorianCalendar gc = new GregorianCalendar();
            SimpleDateFormat s = new SimpleDateFormat("yyyy-MM-dd");
            if ((gc.get(1) - Integer.parseInt(strYear) > 150) || (gc.getTime().getTime() - s.parse(strYear + "-" + strMonth + "-" + strDay).getTime() < 0L)) {
                return "身份证生日不在有效范围";
            }
            if ((Integer.parseInt(strMonth) > 12) || (Integer.parseInt(strMonth) == 0)) {
                return "身份证月份无效";
            }
            if ((Integer.parseInt(strDay) > 31) || (Integer.parseInt(strDay) == 0)) {
                return "身份证日期无效";
            }
            Hashtable h = GetAreaCode();
            if (h.get(iDCardNo.substring(0, 2)) == null) {
                return "身份证地区编码错误";
            }

            // 校验前17位并计算校验码
            char calculatedCheckCode = calculateCheckCode(iDCardNo.substring(0, 17));
            boolean b = calculatedCheckCode == Character.toUpperCase(lastChar);
            if (b == true) {
                return "";
            } else {
                return "身份证无效，不是合法的身份证号码";
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

/*    public static void main(String[] args) {
        String s = IdCardUtil.IdentityCardVerification("510603199202261878");
        System.out.println("s" + s);
    }*/

    /**
     * 根据前17位计算校验码
     *
     * @param idCardPrefix 前17位身份证号码
     * @return 计算出的校验码
     */
    private static char calculateCheckCode(String idCardPrefix) {
        int sum = 0;
        for (int i = 0; i < 17; i++) {
            char c = idCardPrefix.charAt(i);
            sum += Integer.parseInt(String.valueOf(c)) * WEIGHT_FACTOR[i];
        }
        int mod = sum % 11;
        return CHECK_CODE[mod];
    }

    public static void main(String[] args) {
        System.out.println(calculateCheckCode("35052519880210359"));
    }

    private static Hashtable GetAreaCode() {
        Hashtable hashtable = new Hashtable();
        hashtable.put("11", "北京");
        hashtable.put("12", "天津");
        hashtable.put("13", "河北");
        hashtable.put("14", "山西");
        hashtable.put("15", "内蒙古");
        hashtable.put("21", "辽宁");
        hashtable.put("22", "吉林");
        hashtable.put("23", "黑龙江");
        hashtable.put("31", "上海");
        hashtable.put("32", "江苏");
        hashtable.put("33", "浙江");
        hashtable.put("34", "安徽");
        hashtable.put("35", "福建");
        hashtable.put("36", "江西");
        hashtable.put("37", "山东");
        hashtable.put("41", "河南");
        hashtable.put("42", "湖北");
        hashtable.put("43", "湖南");
        hashtable.put("44", "广东");
        hashtable.put("45", "广西");
        hashtable.put("46", "海南");
        hashtable.put("50", "重庆");
        hashtable.put("51", "四川");
        hashtable.put("52", "贵州");
        hashtable.put("53", "云南");
        hashtable.put("54", "西藏");
        hashtable.put("61", "陕西");
        hashtable.put("62", "甘肃");
        hashtable.put("63", "青海");
        hashtable.put("64", "宁夏");
        hashtable.put("65", "新疆");
        hashtable.put("71", "台湾");
        hashtable.put("81", "香港");
        hashtable.put("82", "澳门");
        hashtable.put("91", "国外");
        return hashtable;
    }

    private static boolean isStrNum(String str) {
        Pattern pattern = Pattern.compile("[0-9]*");
        Matcher isNum = pattern.matcher(str);
        if (isNum.matches()) {
            return true;
        }
        return false;
    }

    public static boolean isStrDate(String strDate) {
        Pattern pattern = Pattern.compile("^((\\d{2}(([02468][048])|([13579][26]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][1235679])|([13579][01345789]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(\\s(((0?[0-9])|([1-2][0-3]))\\:([0-5]?[0-9])((\\s)|(\\:([0-5]?[0-9])))))?$");
        Matcher m = pattern.matcher(strDate);
        if (m.matches()) {
            return true;
        }
        return false;
    }
}

